Optimization And Research Of Main Gear Shaping Structure Of The Gear Shaper

Mordern machine is developing toward the direction of high-speed,high-precision and high-efficiency, gear shaper is no exception,at the same time,a lot of problems are brought at the high-speed slotting,such as noise,vibration and impact,which will directly affect the performance of the machine tool,Therefore,it is of great significance to research the dynamic problems of gear shaper.In this thesis,YT5140 Shaper Machine Tool will be studied.Based on the research of gear slotting machining principle and shaper cutters additional rotation law of motion,the relevant theoretical formula is derived,and analysis main transmission mechanism of slotting machine from the dynamics.Now most of the main gear shaping structure of gear shaper use a slider-crank mechanism,the reciprocal velocity of slide changes in a large range which need to increase some useless length of travel during the working process to obtain the uniform velocity.The main gear shaping structure of dynamic performance is directly related to achieved the shaping machine of high speed,high precision.So it is essential to do dynamic simulation analysis.This thesis firstly establishes a virtual prototype model for the main gear shaping structure,then gets dynamic simulation results of the main gear shaping structure.The simulation results show that the traditional main gear shaping structure does not have the quick-return characteristics.Based on comparing characteristics of crank guide rod slider-crank type six bodies with the crank slide block mechanism,this thesis selects crank guide rod slider-crank type six bodies to replace the traditional main gear shaping structure.Take the instantaneous speed of the average speed of the mean-square deviation of the new mechanism while working stroke of the slider and maximum working stroke speed difference as the objective function,take the size of each body of the new mechanism and the angle difference of the inherent body as variables,determine the necessary constraints, simplify the relationship between bodies mathematical equations,use some optimization method to obtain optimal results. Establish the new crank guide rod slider-crank type six bodies with a professional modeling software proe, import in professional system dynamics software adams,output the kinematic parameters of the optimized new institutions,compare the kinematic parameters with the mechanism which is not optimized,to verify the effect of the optimization.From the comparison results,the kinematic parameters of the new mechanism have been greatly improved, which can improve shapping process.With the optimization result,combine with gear box structure size and location of the original system of the gear shaper,to reconstruct the design of a new mechanism,Minimize the inertia force of the mechanism while renovation design,and redesign the cam of the let –knife-body.The modal analysis on the complete machine is very necessary.Using nonlinear analysis software abaqus to obtain the natural frequencies and mode shapes figure, analysis the dangerous vibration frequency, At a certain insertion speed, design the number of teeth of the drive gear reasonably, Which can be a reference for the whole design.